A Study of Rockburst Hazard Evaluation Method in Coal Mine

Abstract

With the increasing of coal mining depth, the mining conditions are deteriorating, and dynamic hazard is becoming more likely to happen. This paper analyzes the relations and differences between rockburst in the coal mine and rockburst in the metal mine. It divides coal mine rockburst into two types including static loading type during roadway excavation process and dynamic loading type during mining face advancing. It proposes the correlation between the formation process of rockburst and the evolution of overlying strata spatial structure of the stope, criterion of rockburst occurrence, new classification, and predictive evaluation method for rockburst hazard that rockburst damage evaluation (RDE) = released energy capacity (REC)/absorbed energy capacity (AEC). Based on the relationship between RDE value and its corresponding level of rockburst hazard, the rockburst hazard can be divided into five types and evaluation index of each type can be achieved. Then the ongoing rockburst damage level can be classified in one of the five types, and the relative parameters, such as hazard extent, controlling measures also can be achieved. This new quantitative method could not only assess the impacting direction of rockburst occurrence, but also verify the effect of preventive measures for rockburst.

Blasting Delay Pattern Development in the Light of Rockburst Prevention – Case Study from Polish Copper Mine

“…This may include both the falling of rocks from the roof, as well as dynamic rock ejection into the workings resulting from rockburst. Such hazards occur frequently in mining worldwide and entail great risks for the personnel located in their impact zone [1][2][3][4][5]. The occurrence of rockbursts, which are caused by dynamic seismic events, is also relatively difficult to predict and control.…”

Strength and Failure Characteristics of Natural and Water‐Saturated Coal Specimens under Static and Dynamic Loads

“…Microseismic monitoring can play an important role in the prediction of the rock bursts in deep mines [1][2][3]. As the moisture content of coal increases or decreases, the characteristics of microseismic and acoustic emissions also change.…”

Dynamic Fracture Evolution and Mechanical Behavior of Sandstone Containing Noncoplanar Elliptical Flaws under Impact Loading

“…Rock mass is a complex natural medium containing various defects, such as flaws, fissures, pores, and holes, where new cracks always initiate, then propagate, and coalesce with each other into macroscale fractures, leading to the rapid damage and failure to lower the stability of rock structures such as underground mining craven and tunneling [1][2][3][4].…”